EP0498493B1 - Tête magnétique - Google Patents

Tête magnétique Download PDF

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Publication number
EP0498493B1
EP0498493B1 EP92200249A EP92200249A EP0498493B1 EP 0498493 B1 EP0498493 B1 EP 0498493B1 EP 92200249 A EP92200249 A EP 92200249A EP 92200249 A EP92200249 A EP 92200249A EP 0498493 B1 EP0498493 B1 EP 0498493B1
Authority
EP
European Patent Office
Prior art keywords
layer
metallic material
cladding
core
magnetic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92200249A
Other languages
German (de)
English (en)
Other versions
EP0498493A1 (fr
Inventor
Cornelis Wilhelmus Marie Peter Sillen
Franciscus Wilhelmus Adrianus Dirne
Jacobus Josephus Maria Ruigrok
Wolfgang Binder-Krieglstein
Ulrich Traxlmayr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics NV, Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Publication of EP0498493A1 publication Critical patent/EP0498493A1/fr
Application granted granted Critical
Publication of EP0498493B1 publication Critical patent/EP0498493B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
    • G11B5/23—Gap features
    • G11B5/232—Manufacture of gap
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
    • G11B5/1875—"Composite" pole pieces, i.e. poles composed in some parts of magnetic particles and in some other parts of magnetic metal layers
    • G11B5/1877—"Composite" pole pieces, i.e. poles composed in some parts of magnetic particles and in some other parts of magnetic metal layers including at least one magnetic thin film
    • G11B5/1878—"Composite" pole pieces, i.e. poles composed in some parts of magnetic particles and in some other parts of magnetic metal layers including at least one magnetic thin film disposed immediately adjacent to the transducing gap, e.g. "Metal-In-Gap" structure

Definitions

  • the invention relates to a magnetic head for recording and / or reproducing magnetic information in a track of a magnetic information carrier with a magnetic core with two core parts formed from a ferrite, which form two mutually opposite core surfaces, at least one of which has a covering made of soft magnetic material with a higher saturation magnetization than that of the ferrite, and with an end face on which the information carrier can be moved, and with a non-magnetic transmission gap provided between the core faces and ending in the end face with at least one layer made of a first metallic material and with interconnected layers of a second metallic material, the first metallic material being selected from the group consisting of Mo, Ti, Cr and NiCr, and with one which passes through the coil chamber and is provided around a part of the magnetic core n electrical coil.
  • Such a magnetic head is known from EP-A-0 273 496.
  • ferrites the advantages of high wear resistance, a relatively high specific resistance and good magnetic properties with regard to the coercive force and the permeability.
  • Magnetic fields generated by a magnetic head at the location of the transmission gap to record information on a magnetic medium are directly dependent on the saturation magnetization of the core material of the magnetic head.
  • Ferrites generally have a saturation magnetization sufficient to write information to conventional tapes, such as CrO2 tapes with a coercive force H c of about 700 Oe.
  • H c coercive force
  • ME magnetic tapes based on Co-Ni conventional magnetic heads that have only ferrite on both sides of the transmission gap are less suitable.
  • the magnetic fields used to record information on a magnetic medium and generated by such magnetic heads are limited by the relatively low saturation magnetization of the ferrite. The field strength of the writing field is therefore insufficient to be able to optimally describe magnetic tapes with a high coercive force.
  • the magnetic head shown is provided with a transmission gap which extends between two core parts and which is composed of a number of layers of non-magnetic material.
  • the core parts are each provided with a core surface facing the gap, on which a cladding made of Ni80F20 is applied in the atomization process.
  • Each of the insulating layers is provided with an Mo layer, and each of the Mo layers contains an Au layer, the Au layers being connected to one another by thermocompression.
  • the SiO2 insulating layer in the transmission gap acts as a barrier between the soft magnetic material of the cladding, which is formed, for example, from an alloy based on Ni-Fe or Fe-Al-Si, and the metallic materials of the transmission gap is effective, whereby an electrochemical interaction between the cladding and the transmission gap is avoided.
  • a disadvantage of the existing SiO2 insulating layer is the relatively poor adhesion to the cladding layer.
  • the invention has i.a. to improve the magnetic head mentioned at least in the mechanical aspect.
  • the magnetic head according to the invention is characterized in that the cladding has a first cladding layer made of an alloy based on Ni-Fe and a second cladding layer made of an amorphous alloy based on Co-Ti and / or Zr and / or Hf-Nb - And / or Ta base, wherein the first metallic material of the transmission gap is attached directly to the amorphous alloy of the cladding.
  • the transmission gap can consist exclusively of metallic layers be put together.
  • the first metallic material acts primarily as an adhesive layer between the amorphous alloy of the covering and the second metallic material of the transmission gap.
  • Gold, silver and platinum are perfectly suitable as the second metallic material.
  • One of the possible amorphous alloys mentioned is, for example, Co 86.1 Zr 2.9 NB 11.0 , this material having a high saturation magnetization and permeability as well as a low magnetostriction.
  • An embodiment of the magnetic head according to the invention is characterized in that an intermediate layer which is optically contrasting with the cladding is provided in the transmission gap between the layer made of a first metallic material and one of the layers made of a second metallic material.
  • the intermediate layer is preferably formed from an oxide and / or a nitride.
  • An embodiment of the magnetic head according to the invention wherein the second metallic material of the transmission gap has been selected from the group Au, Ag and Pt, has the characteristic that the oxide of the intermediate layer is SiO2, Al2O3 or ZrO2.
  • one embodiment is characterized in that a further layer made of a metallic material is provided between the optically contrasting intermediate layer and the layer made of a second metallic material. Excellent results are achieved if the metallic material of the further layer is selected from the group Mo, Ti, Cr and NiCr.
  • An embodiment of the magnetic head according to the invention is characterized in that the first cladding layer made of an alloy based on Ni-Fe extends between a core surface and the second cladding layer, wherein the first cladding layer made of an alloy based on Ni-Fe is arranged on a base layer provided on the core surface made of a material from the group consisting of Cr, Mo or titanium oxide.
  • the base layer serves to improve the mechanical adhesion of the Ni-Fe-based alloy (Sendust) on the ferrite of the magnetic core.
  • An embodiment of the magnetic head according to the invention is characterized in that the transmission gap width is achieved by using a laser technique. So far, it was believed that MIG heads were not suitable for slit-width lasering.
  • all layers lying between the core surfaces can have the same width.
  • the MIG head (metal-in-gap head) according to the invention shown in FIGS. 1 and 2 is suitable for writing and reading out magnetic tapes with a high coercive force.
  • the magnetic head has a magnetic core composed of two core parts 1 and 3, in which a coil chamber 5 is arranged. A coil 7 passing through the coil chamber 5 is wound around one of the core parts.
  • the core parts 1 and 3 each have a core surface 1A or 3A facing the gap 11, on which a cladding 13 made of soft magnetic material with a higher saturation magnetization than that of the ferrite is arranged.
  • the cladding 13 on each of the core surfaces 1A and 3A consists of a first cladding layer 15 made of an alloy based on Ni-Fe, for example Ni80Fe20, and a second cladding layer 17 made of an amorphous alloy based on Co-Ti and / or Zr and / or Hf-Nb and / or Ta base, for example Co 86.1 Zr 2.9 Nb 11.0 .
  • the gap 11 consists of two layers 21 made of a first metallic material selected from the group Mo, Ti, Cr and NiCr and two layers 23 made of a second metallic material selected from the group Au, Ag and Pt is.
  • the first metallic material is Mo
  • the second metallic material is Au.
  • the layers 21 are immediate, i.e. without any intermediate layer, arranged on the second cladding layers 17 made of an amorphous alloy.
  • the layer 21 acts as a diffusion barrier and as an adhesive layer between the amorphous alloy and the second metallic material of the layers 23.
  • the layers 23 are attached to one another by thermal compression.
  • the method for producing the magnetic head according to the invention shown in FIGS. 1 and 2 is characterized in that a first cladding layer 15 made of an alloy based on Ni-Fe and a second cladding layer 17 made of an amorphous layer are successively on each of the core parts 1 and 3 Alloy of a composition already mentioned, a layer 21 made of a first metallic material and a layer 23 made of a second metallic material is applied, after which the two layers 23 are attached to one another under increased pressure and elevated temperature, after which the desired gap width is achieved with the aid of laser technology becomes.
  • a base layer 19 which acts as an adhesive layer can be applied to the core surfaces 1A and 3A before the first cladding layers 15 are applied. All layers are preferably applied by sputtering.
  • the gap 111 shown in FIG. 3 is located between two second cladding layers 17 of a cladding which corresponds to the cladding of the magnetic head in FIGS. 1 and 2 or is similar to this cladding.
  • the transmission gap 111 consists of two layers 121 made of a first metallic material directly attached to the second cladding layers 17, two intermediate layers 122 made of a material optically contrasting to the cladding, for example SiO 2, two further layers made of a metallic material attached to the intermediate layers 122 and two layers 123 of a second metallic material attached to the further layers 124.
  • the first metallic material of the layers 121 and the metallic material of the further layers 124 have been selected from the group Mo, Ti, Cr and NiCr.
  • the second metallic material of layers 123 has been selected from the group consisting of Au, Ag and Pt.
  • the layers 123 are attached to one another by thermal compression.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Magnetic Heads (AREA)

Claims (8)

  1. Tête magnétique pour l'enregistrement et/ou la reproduction d'information magnétique dans une piste d'un support d'information magnétique comportant
    - un noyau magnétique muni de deux parties de noyau en ferrite (1, 3) qui constituent deux faces de noyau opposées (1A, 3A) dont au moins l'une est munie d'un revêtement (13) en matériau magnétique doux présentant une saturation magnétique supérieure à celle du ferrite,
    - une face terminale (9) le long de laquelle peut être déplacé le support d'information,
    - un entrefer de transmission non magnétique (11, 111) prévu entre les faces de noyau, se terminant dans la face terminale (9) et muni d'au moins une couche (21, 121) en un premier matériau métallique et de deux couches reliées entre elles (23, 123) en un deuxième matériau métallique, le premier matériau métallique étant choisi dans le groupe comprenant Mo, Ti, Cr et NiCr et
    - une bobine électrique (7) prévue autour d'une partie du noyau magnétique (3) et traversant une chambre de bobine (5), caractérisée en ce que le revêtement (13) présente une première couche de revêtement (15) en un alliage à base de Ni-Fe sur laquelle est appliquée une deuxième couche de revêtement (17) en un alliage amorphe à base de Co-Ti et/ou Zr et/ou Hf-Nb et/ou Ta, le premier matériau métallique (21, 121) de l'entrefer de transmission (11, 111) étant appliqué de façon directe sur l'alliage amorphe du revêtement (17).
  2. Tête magnétique selon la revendication 1, caractérisée en ce que dans l'entrefer de transmission (111), entre la couche (121) en un premier matériau magnétique et l'une des couches (123) en un deuxième matériau métallique est prévue une couche intermédiaire (122) en un deuxième matériau magnétique formant un contraste optique avec le revêtement.
  3. Tête magnétique selon la revendication 2, caractérisée en ce que la couche intermédiaire (122) est formée en un oxyde et/ou un nitrure.
  4. Tête magnétique selon la revendication 2 et 3, dans laquelle le deuxième matériau métallique de l'entrefer de transmission (111) est choisi dans le groupe comprenant Au, Ag et Pt, l'oxyde de la couche intermédiaire étant SiO₂, Al₂O₃ ou ZrO₂.
  5. Tête magnétique selon la revendication 2, 3 ou 4, caractérisée en ce qu'entre la deuxième couche intermédiaire de contraste optique (122) et la couche (123) en un deuxième matériau métallique est prévue une autre couche (124) en un matériau métallique.
  6. Tête magnétique selon la revendication 4 et 5, caractérisée en ce que le matériau magnétique de l'autre couche (124) est choisi dans le groupe comprenant Mo, Ti, Cr et NiCr.
  7. Tête magnétique selon l'une des revendications 1 à 6, caractérisée en ce que la première couche de revêtement (15) réalisée en un alliage à base de Ni-Fe s'étend entre une face de noyau (1A, 3A) et la deuxième couche de revêtement (17), la première couche de revêtement (15) en un alliage à base de Ni-Fe étant appliquée sur une couche de base (19) prévue sur la face de noyau (1A, 3A) et réalisée en un matériau choisi dans le groupe comprenant Cr, Mo ou oxyde de titane.
  8. Tête magnétique selon l'une des revendications précédentes 1 à 8, caractérisée en ce que les deux faces de noyau (1A, 3A) et toutes les couches situées entre ces deux faces de noyau (1A, 3A) s'étendent parallèlement et la largeur de l'entrefer de transmission (11, 111) est inférieure à celle de la première couche de revêtement (15).
EP92200249A 1991-02-04 1992-01-29 Tête magnétique Expired - Lifetime EP0498493B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9100192A NL9100192A (nl) 1991-02-04 1991-02-04 Magneetkop.
NL9100192 1991-02-04

Publications (2)

Publication Number Publication Date
EP0498493A1 EP0498493A1 (fr) 1992-08-12
EP0498493B1 true EP0498493B1 (fr) 1996-04-03

Family

ID=19858824

Family Applications (1)

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EP92200249A Expired - Lifetime EP0498493B1 (fr) 1991-02-04 1992-01-29 Tête magnétique

Country Status (5)

Country Link
US (1) US5210668A (fr)
EP (1) EP0498493B1 (fr)
JP (1) JPH0573829A (fr)
DE (1) DE59205886D1 (fr)
NL (1) NL9100192A (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2933491B2 (ja) * 1993-10-04 1999-08-16 松下電器産業株式会社 磁気ヘッドの製造方法
JP3707166B2 (ja) * 1996-01-29 2005-10-19 ソニー株式会社 磁気ヘッド
US5978186A (en) * 1996-03-14 1999-11-02 Matsushita Electric Industrial Co., Ltd. Magnetic head and reproducing apparatus with head having central core with winding thereabout and wire therethrough
DE10057847A1 (de) * 2000-11-22 2002-05-29 Fujitsu Siemens Computers Gmbh Kommunikationseinheit
US7500302B2 (en) * 2005-04-11 2009-03-10 Hitachi Global Storage Technologies, Netherlands B.V. Process for fabricating a magnetic recording head with a laminated write gap
US7525760B2 (en) * 2005-04-11 2009-04-28 Hitachi Global Storage Technologies B.V. Laminated write gap to improve writer performance

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5345221A (en) * 1976-10-05 1978-04-22 Pioneer Electronic Corp Magnetic head
EP0273496B1 (fr) * 1986-12-03 1991-04-10 Koninklijke Philips Electronics N.V. Tête magnétique comportant un entrefer en matériau dur électrochimiquement inerte
US4780779A (en) * 1987-11-19 1988-10-25 Ampex Corporation Laminated sendust metal-in-gap video head
JPH0258714A (ja) * 1988-08-23 1990-02-27 Nippon Mining Co Ltd 磁気ヘッド
US4942658A (en) * 1988-11-30 1990-07-24 Magnetic Peripherals Inc. Method for manufacturing a magnetic head core with a flux gap having a precisely controlled length
US5001589A (en) * 1989-05-31 1991-03-19 Seagate Technology, Inc. Tungsten and tantalum diffusion barriers for Metal-In-Gap magnetic heads

Also Published As

Publication number Publication date
DE59205886D1 (de) 1996-05-09
JPH0573829A (ja) 1993-03-26
NL9100192A (nl) 1992-09-01
EP0498493A1 (fr) 1992-08-12
US5210668A (en) 1993-05-11

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